Owens Corning Attic Insulation: The San Francisco Owner’s Guide
We install Owens Corning attic insulation throughout San Francisco, and most blown-in jobs run $1,800 to $4,200 depending on square footage, current R-value, and whether air sealing is included. Same-day and next-day appointments are available, and the written price you approve before work starts is the price on the invoice. Homeowners usually call us after noticing cold rooms upstairs, a furnace that runs without relief, or an energy bill that climbed for no obvious reason. Sometimes it’s simpler: they opened the attic hatch and saw insulation that looked tired, settled, or damp.
Which Owens Corning Models This Applies To
Most San Francisco attics we work on fall into one of three Owens Corning lines: the AttiCat blown-in fiberglass system, ProPink fiberglass batts, or the newer EcoTouch PINK FIBERGLAS batts and rolls. If you’re looking at an existing Owens Corning installation, you’ll usually find the product name printed on the kraft paper facing of the batts or on a label stapled near the attic access. The gotcha worth knowing: Owens Corning changed the compression specs between older and newer batt lines, and a batt sized for an R-30 cavity from the early 2000s won’t match the current R-30 density. We carry the current AttiCat loose-fill and EcoTouch batts on our trucks; for older ProPink stock that’s been discontinued, we match R-value and cavity fit rather than chasing an exact SKU. On the OEM versus aftermarket question, there isn’t really an aftermarket equivalent to Owens Corning fiberglass in the way there is for mechanical parts. What matters is matching the R-value, the facing type, and the attic’s venting profile to the specific house. We’re an independent installer, not an Owens Corning company, which means we recommend what fits your attic, not what pushes a brand.
Signs Your Owens Corning Attic Insulation Is Failing
- Upstairs rooms run 5 to 8 degrees colder than the rest of the house. This is the most common first signal in San Francisco, especially in Sunset District and Richmond District homes where the marine layer keeps things damp. Insulation that’s settled or compacted can’t hold the thermal barrier it did when it was installed.
- Your furnace cycles on and off more than it used to. When attic insulation loses loft, the conditioned air you’re paying for escapes through the ceiling plane. The system works harder, and the runtime climbs even though the thermostat setting hasn’t changed.
- You see dark, discolored patches in the insulation. In San Francisco’s fog-driven humidity, a small roof leak or bathroom vent leak shows up as staining in the fiberglass. Once Owens Corning fiberglass gets damp, its R-value drops and it never fully recovers, even after drying.
- Batts are sagging or falling away from the attic floor. Old paper-faced batts lose their friction fit over decades, especially in Victorian and Edwardian homes where attic framing has shifted. Gaps between batts and joists cost more than you’d guess.
- Energy bills climb during summer months even though usage hasn’t changed. San Francisco’s summer fog alternates with warm inland air, and a weak attic barrier means your home swings with the weather. If the attic insulation hasn’t been touched in 20-plus years, it’s almost certainly underperforming.
Replacement Cost & What’s Included
For a typical San Francisco attic, blown-in Owens Corning AttiCat insulation runs $1,800 to $4,200 installed, depending on square footage and the target R-value. Smaller attics under 800 square feet with existing insulation that just needs topping off land on the lower end. Larger attics, full removal and reinstall, or adding air sealing before the insulation goes down run higher. Every Alden Insulation San Francisco job includes written pricing before we start, removal of the failed material if needed, the new Owens Corning insulation installed to spec, and our 365-Day Done Right Promise: if the work fails within a year, we return and make it right at no charge. No revision at the door. The number you approve is the number on the invoice.
DIY or Call Us?
There are a few things you can safely check yourself: look at the attic floor and see whether insulation is evenly distributed, note any obvious gaps near the hatch or around recessed lighting, and check for damp spots after heavy rain. What you shouldn’t do is pull out old insulation without identifying what you’re dealing with. Older Owens Corning batts in San Francisco homes sometimes hide rodent droppings, and some pre-1990 properties still have vermiculite in the attic mix that may contain asbestos. Disturbing it sends fibers into the air. If you’re just topping off with a few new batts in an accessible area and you’ve confirmed the existing material is clean fiberglass, that’s a reasonable weekend project. If you’re dealing with settled blown-in, damp material, or you need a real R-value upgrade, call us at (559) 245-9792. We’ll give you an honest read on what the attic actually needs.
FAQs
Blown-in Owens Corning fiberglass typically holds its R-value for 30 to 40 years in San Francisco if the attic stays dry and undisturbed, but real-world performance in fog-zone homes often degrades sooner due to moisture and settling. The material doesn’t rot or decay, but compression and dampness cut its effectiveness over time. If your insulation is older than 20 years, it’s worth having it inspected. Call (559) 245-9792 for an honest assessment, not a sales pitch.
Yes, in many cases we can top off blown-in insulation or re-seat sagging batts rather than doing a full replacement. The repair path works when the existing material is dry and structurally intact but underperforming. If the insulation shows water damage, pest contamination, or heavy compression, replacement is the better long-term value. We’ll tell you which one your attic actually needs.
Most San Francisco attic insulation jobs are completed in one working day, including removal if needed and cleanup afterward. Larger attics or jobs that require air sealing first can run into a second day. We arrive inside the scheduled window, in uniform, and leave the attic cleaner than we found it.
We stock Owens Corning AttiCat blown-in fiberglass and EcoTouch batts on our trucks, so most jobs are done same day without waiting on supply drops. If your project calls for a specific facing or density that isn’t on the truck, we’ll have it within 48 hours and you’ll know before we schedule. We also work with other brands like Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, Demilec, and GreenFiber, plus Reflectix for radiant barriers, so the recommendation matches the house, not the truck inventory.
Contact Alden Insulation San Francisco
If your Owens Corning attic insulation is failing, call (559) 245-9792. We’ll schedule a visit, assess the attic honestly, and put a written price in your hand before any work begins. Calls are answered by a live person, 24/7. Bryce Holloway and his crew have been working San Francisco attics for years, with a good stretch of it spent on older Sunset District Victorians where the fog makes thermal performance a constant fight. Good insulation doesn’t announce itself. You just stop noticing the cold.
Written by Bryce Holloway, Owner, Alden Insulation San Francisco at Alden Insulation San Francisco, serving San Francisco and nearby areas.